1999 Volume 24 Issue 74 Pages 101-111
This study concerns about emergency ventilating operation during fire accidents in road tunnels with large cross section (115m^2) on the Second Tomei-Meishin Expressway in Japan. The movement of fire plume and smoke induced by fire accidents is simulated using three-dimensional CFD. The result shows that under high longitudinal velocity (10m/s), the evacuate environment in a large cross section tunnel (3-lane road tunnel) is safer than in the conventional 2-lane road tunnel. Result also shows that under low longitudinal velocity (2m/s), both the temperature and the concentration of smoke of thermal fume in a large cross section tunnel are lower than that in the conventional 2-lane tunnel, meaning that a better evacuate environment can be expected near the ground of a 3-lane road tunnel with large cross section.
